2 research outputs found
Modeling the Electric Double Layer at the Liposome Vesicle via Classical Density Functional Theory: Solution of Poisson’s Equations for Curved Membranes
The
electric double layer at the liposome vesicle membrane has
been investigated by a modified fundamental-measure theory in the
framework of the restricted primitive model. An analytical equation
has been obtained for the mean electrostatic potential (MEP) by solving
Poisson’s equation for curved membranes. This study investigates
the influence of vesicle size, membrane thickness, surface charges,
and electrolyte concentration on the structure, composition, and width
of electric double layers (EDLs) on the inner and outer membrane walls.
Our findings indicate that a thin and denser layer of ions is formed
at the concave wall of the membrane (inner wall) compared to that
at the outer membrane. As expected, the width of the diffuse layer
decreases with the concentration and surface charge. Also, when the
surface charges on both concave and convex walls are the same, the
absolute value of MEPs on the inner membrane, concave wall, is greater
than that on the convex wall. We have also investigated the diffuse
potential, which decreases with concentration, membrane thickness,
and cavity size, whereas it increases with surface charges. As we
expect, the contact density of counterions at the inner concave wall
of the vesicle cavity is always greater than the corresponding value
at the convex wall, whereas this trend reverses for co-ions. Also,
the contact density of counterions (co-ions) at the inner wall decreases
(increases) with cavity size, whereas it increases at the outer wall
(decreases). Finally, depletion of co-ions occurs at the membrane
walls with enhancement in surface charges
Electro-Organic Synthesis of Nanosized Particles of 2-Amino-pyranes
We have developed a convenient and efficient method for
the electrosynthesis
of nanosized particles of 2-amino-pyrane derivatives through the reaction
of aromatic aldehyde or isatin against malononitrile and 1,3-dicarbonyl
compound inside an undivided cell where sodium bromide was present
as electrolyte in propanol medium. This procedure resulted in efficient
and selective formation of the products